MTUS1 and tongue squamous cell carcinoma: Reduced MTUS1 expression is also associated with poor prognosis in lung adenocarcinoma [11], gallbladder adenocarcinoma [12], renal cell carcinoma [13], bladder carcinoma [14,15], adenoid cystic carcinoma of the salivary gland [16], and squamous cell carcinoma of the tongue [17].